... bauxite, dolomite, iron and so on ) through forcing booster, preload screw precision machining, made of high density ball billet, is widely ... is important, there are generally three ways:First,belt feeder feed due to the economical and practical feeding methods became ... users of the First.Second, level spiral feeder feed, applies a narrower rolls.Last,preload screw feeder. Dosing purpose is to make the ...